arXiv 2203.079442022-03-15hep-ex

在ILC 250 ° C下使用辐射返回测量$A_{LR}$

Measurement of $A_{LR}$ using radiative return at ILC 250

Takahiro Mizuno, Keisuke Fujii, Junping Tian

备注：: contribution to Snowmass 2021

摘要：

对于ILC 250的精密度研究，$A_{LR}$的测量非常重要，因为它可以约束SMEFT参数。当前最佳测量的$A_{LR}$值是在SLC测量的$A_{LR} = 0.1514 \pm 0.0019\,(stat) \pm 0.0011\,(syst)$，并且需要更精确的值以用于TeV尺度的新物理搜索的全局拟合。在ILC，我们可以使用$e^+ e^- \to γZ$过程来评估$A_{LR}$。我们进行了一个完整的模拟研究的$e^+ e^- \to γZ$过程中的质心能量为250 GeV，并评估了我们可以提高多少精度，这个观察。ILC 250下$A_{LR}$的统计误差为$1.8 \times 10^{-4}$。系统误差的主要来源是光束偏振引起的误差。作为系统误差的其他来源，每个偏振组合的亮度和选择效率的乘积上的误差的不相关部分也有贡献。包括这些系统误差，估计$A_{LR}$的总绝对误差为0.00025，比SLC的精确度（0.00219）高8.8倍。

英文摘要：

For the precision study at the ILC 250, measurement of $A_{LR}$ is important as it can constrain SMEFT parameters. The current best measured $A_{LR}$ value is $A_{LR} = 0.1514 \pm 0.0019\,(stat) \pm 0.0011\,(syst)$ which was measured at the SLC, and a more precise value is required for the global fit for the new physics search in TeV-scale. At the ILC, we can use the $e^+ e^- \to γZ$ process to evaluate the $A_{LR}$. We performed a full simulation study of the $e^+ e^- \to γZ$ process at the center-of-mass energy of 250 GeV and evaluated how much we can improve the precision of this observable. The statistical error on $A_{LR}$ at the ILC 250 turned out to be $1.8 \times 10^{-4}$. Major source of the systematic error was error from the beam polarization. As other sources of the systematic error, the uncorrelated parts of error on the product of luminosity and selection efficiency for each polarization combination contribute. Including those systematic errors, total absolute error on $A_{LR}$ was estimated to be 0.00025, 8.8 times better precision than that from the SLC (0.00219).

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